import SwiftUI

@available(macOS 11, iOS 13, watchOS 6, tvOS 13, *)
struct LeftAligned: ViewModifier {
	func body(content: Content) -> some View {
		HStack {
			content
			Spacer()
		}
	}
}

@available(macOS 11, iOS 13, watchOS 6, tvOS 13, *)
extension View {
	func leftAligned() -> some View {
		return self.modifier(LeftAligned())
	}
}

@available(macOS 11, iOS 13, watchOS 6, tvOS 13, *)
extension Color {
	init?(hex: String) {
		let hex = hex.trimmingCharacters(in: CharacterSet.alphanumerics.inverted)
		var int: UInt64 = 0
		Scanner(string: hex).scanHexInt64(&int)
		let a, r, g, b: UInt64
		switch hex.count {
		case 3: // RGB (12-bit)
			(a, r, g, b) = (255, (int >> 8) * 17, (int >> 4 & 0xF) * 17, (int & 0xF) * 17)
		case 6: // RGB (24-bit)
			(a, r, g, b) = (255, int >> 16, int >> 8 & 0xFF, int & 0xFF)
		case 8: // ARGB (32-bit)
			(a, r, g, b) = (int >> 24, int >> 16 & 0xFF, int >> 8 & 0xFF, int & 0xFF)
		default:
			return nil
		}

		self.init(
			.sRGB,
			red: Double(r) / 255,
			green: Double(g) / 255,
			blue:  Double(b) / 255,
			opacity: Double(a) / 255
		)
	}
}

extension Optional where Wrapped: Collection {
	var isEmptyOrNil: Bool {
		return self?.isEmpty ?? true
	}
}
